Flier printed in blue on both sides, with cut of a steamship. 21.5x13 cm. (8½x5").

Rare advertising flier for the North American Steamship Co., a rival to the Pacific Mail Steamship Co., with steamers from New York to the Isthmus, then connections from the Pacific side to California. The flier begins "North American Steamship Co. Opposition to Monopoly Through Lite to California, via Aspinwall and Panama, Touching at Manzanillo..." On the verso is the reassurance of "Passage via Panama Railroad" across the Isthmus, with freight options available.